---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-26-091866"
form_type: "8-K"
ticker: "PLMK"
cik: "0002030482"
company_name: "Plum Acquisition Corp, IV"
filed_at: "2026-08-20T01:48:12+00:00"
generated_at: "2026-08-20T10:05:26.980215+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "medium"
source: SEC EDGAR
---

# Plum IV updates investor presentation for CTR geothermal-lithium merger; no new deal terms

## Summary
- Updated investor presentation dated Aug 19, 2026 supersedes March 9, 2026 version for proposed business combination with Controlled Thermal Resources.
- CTR's Hell's Kitchen Project in Imperial County, CA is described as one of America's largest advanced geothermal power + critical minerals projects.
- Combined company expected to trade pro forma on Nasdaq under ticker CTRH; equipment staged and externally validated per presentation.
- No revised valuation, financing terms, or closing conditions disclosed; merger remains subject to shareholder and regulatory approvals.
- Plum IV and CTR intend to file S-4 registration with proxy statement/prospectus; parties urge review of future SEC filings.

## SEC filing metadata
- accession: 0001213900-26-091866
- form_type: 8-K
- ticker: PLMK
- cik: 0002030482
- company_name: Plum Acquisition Corp, IV
- filed_at: 2026-08-20T01:48:12+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: medium
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2030482/000121390026091866/0001213900-26-091866-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2030482/000121390026091866/ea0302754-8k425_plum4.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-26-091866
- JSON: https://secwatch.observer/filing/0001213900-26-091866.json
- Plain text: https://secwatch.observer/filing/0001213900-26-091866.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.